24 King William Street, London
The £23 million renovation of the 80,730 ft² building, located on the northern approach to London Bridge, was designed by Ben Adams Architects and includes the addition of two new storeys.
An elegant reception area comprises of a double height entrance hall leading into a lift lobby, finished with Portland stone floors and feature walls in marble and leather, with brass accents throughout. To reflect the style within, striking perforated Proteus SC TECU Brass panels and bespoke vertical fins and trim flashings, with an Artisan hand applied patinated finish were specified for the ground level, street facing elevations.
The fins at 24 King William Street are designed around a rigid bespoke aluminium extrusion that connects to the curtain wall glazing system. The outer TECU Brass element of the fins are profiled in shape and taper across the length to generate an angled effect – the fins increasingly extend outwards as they ascend – whilst the connection of the material to the extrusion and the window frame remains constant.
The internal aluminium structure of the fins provides the necessary support and structural connection back to the curtain walling. This also created a depth at the rear, hiding the curtain wall system from plain view and giving passers by the perception that the fins float in front of the glazing system.
The combination of thin gauge brass material and internal aluminium support framework ensured that this element of the façade met budgetary requirements. Proteus’s in-house expertise also overcame the difficult folding requirements of the TECU Brass fin profile, which were towards the limits of current bending technology.
The fins are complemented by Proteus SC perforated panels, which are fixed over insulated spandrel panels within the curtain wall system. These panels hide the ventilation elements of the curtain wall and blend the fins and curtain wall system together. The panels were finished with the Artisan patination effect which is created by applying a fine linear /orbital grain brush effect to the face of the material before having the chemical application and sealing. The panels will gradually weather over time and continue to embellish the already highly desirable warm ochre hues of the Artisan hand patinated finish.
The TECU Brass is developed by blending copper and zinc, which creates an extremely tough, robust façade and then applying a patinated finish that adds texture and contrast, giving a richly aged aesthetic. This rich diversity of the copper-alloy material allows unparalleled variety and high-quality aesthetics, complementing the natural stone and brass tones of the lobby.
A touch of zinc
The rear elevation of the nine-storey building near Monument station features an equally impressive façade complete with Proteus HR Graphite Grey Rheinzinc rainscreen panels. This zinc material then wraps up and over, forming a curved zinc roofing system which blends vertical and horizontal elevations into one. The material is gaining favour with architects and developers as it provides a long, maintenance-free life and offers adaptability to various design styles ranging from traditional to modern.
Once dominated by rambling plant rooms, the interior of the zinc roof is now home to state of the art offices overlooking the City and the River Thames. A limestone façade featured on the front of the building connects to the roof through Proteus’ perforated flat sheets in a United Anodisers UnAtex bespoke finish.
These United Anodisers UnAtex panels are also integrated within the windows on the top two floors, and then flow up and onto the roof generating the patterned effect, while making is look like the façade and roof become one element.
Together this juxtaposition of materials has helped to bring an outdated and under-utilised 1980’s office building back into use; transforming it into a modern, aesthetically pleasing structure that stands out amongst many others in a prominent and sought-after location within the Capital.
Redeveloped to a Grade A specification, the building includes a tranquil new garden coupled with new retail spaces at ground floor level.